[SOLVED] C/C++ Serial port programming

[grumpos]

Hi,
I've a problem with a serial port adapter. This is what i've done:
lsusb

 Bus 001 Device 005: ID 05d1:5001 Brainboxes, Ltd 
  

 sudo modprobe usbserial vendor=0x05d1 product=0x5001
sudo chmod o+rw /dev/ttyUSB0 
  

and the adapter is attached to /dev/ttyUSB0 and /dev/ttyUSB1

 [ 1596.261797] usb 1-1.4: new full-speed USB device number 5 using ehci_hcd
[ 1596.368458] usbserial_generic 1-1.4:1.0: generic converter detected
[ 1596.368667] usb 1-1.4: generic converter now attached to ttyUSB0
[ 1596.371816] usbserial_generic 1-1.4:1.1: generic converter detected
[ 1596.371982] usb 1-1.4: generic converter now attached to ttyUSB1 
  

Now, this is the code for comunication

 void SerialPort::openPort(char *port){
    struct termios options;
    this->fd = open("/dev/ttyUSB0", O_RDWR | O_NOCTTY | O_NDELAY);
    if(this->fd == -1){
        std::cout << "Error open port" << std::endl;
        std::cout << "-" << strerror( errno ) << "-" << std::endl;
    }
    fcntl(this->fd, F_SETFL, FNDELAY);

    tcgetattr(this->fd, &options);
    cfsetispeed(&options, B115200);
    cfsetospeed(&options, B115200);
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;

    options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);

    options.c_cflag |= (CLOCAL | CREAD);
    options.c_iflag &= ~(IXON | IXOFF | IXANY);
    tcflush(this->fd, TCIFLUSH);
    tcsetattr(this->fd, TCSANOW, &options);
}

void SerialPort::t_readData(){
    int len = 1;
    char byte[10] = {0};
    long long count = 0;
    if(this->fd == -1) return;
    //tcflush(this->fd, TCIFLUSH);

    len = write(this->fd, "\xAA", sizeof(char));
    if(len < 0){
       std::cout << "Error write serial port" << std::endl;
       return;
    }

    std::ofstream tmpf("/tmp/data.txt", ios_base::out | ios_base::binary);
    sleep(1);
    std::cout << "Reading" << std::endl;
    while (len > 0){
        len = read(this->fd, byte, sizeof(byte));
        if(len > 0)
           //std::cout << byte << std::endl;
           tmpf.write(byte, sizeof(byte));
        count++;

    }
    std::cout << "End Reading" << std::endl;
    tmpf.close();
    std::cout << count << std::endl;
    close(this->fd);
} 
  

The adapter is for a nexys2 card, whitch read a start byte (AA hex) and send 32byte of data for 100 times.
My problem is that the program read a variable number of byte, mostly a sequence of 01 60 (hex)
And this happens even with the card turned off !!

On terminal (with the card turn off) if I do

cat /dev/ttyUSB0

It starts to print binary symbols...

Someone know its happens?

My distro is mint 13 (Maya)

Thanks

[grumpos]

Hi
Finally i've a solution:

I've to use ftdi_sio module instead usbserial to make work Brainboxes adapter !